1.34mm Headset — 11/8' Threadless (for 34mm ID head tubes / 28.6mm steerer) What it is Complete bearing bowl headset set for frames with a 34.0 mm inner diameter head tube and forks with a 28.6 mm outer diameter (11/8') threadless steerer. Includes upper and lower cups, two imported stainlesssteel sealed bearings (upper and lower), and a CNCmachined aluminum alloy shell. Why you need it Restores precise steering and alignment between fork and frame to prevent wobble, uneven wear, and handling issues. Sealed bearing system keeps rotation smooth and reduces maintenance by resisting dirt and moisture. CNCmachined aluminum shell and forged construction provide a precise fit and reliable load distribution for consistent steering feel. Key features and benefits Compatibility: Designed for standard and road bike builds using 11/8' threadless fork systems and modern head tubes that require 34–34 mm headset sizing. Sealed bearings: Two imported stainlesssteel sealed bearings (upper and lower) deliver longlasting smooth rotation and improved resistance to contamination and moisture for consistent performance in varied conditions. CNCmachined aluminum shell: Precisionmachined shell ensures accurate seating of cups and bearings for smooth steering and predictable handling. Durable, lightweight construction: Total set weight approximately 120 g; anodized finish available in black, blue, or silver for corrosion resistance and a clean appearance. Load distribution: Forged shell structure improves strength and spreads loads more evenly to reduce premature frame or bearing wear. Practical applications (use scenarios) Road riding: a worn headset on a road bike to restore crisp steering response and stable handling at higher speeds. Trail and offroad use: Install on a mountain or gravel bike where sealed bearings and robust shell construction help maintain performance through wet, dusty, or rough conditions. Bike build or upgrade: Use in a custom or replacement build for frames and forks that use 34 mm head tube inner diameter and 28.6 mm steerer size to ensure correct alignment and longterm reliability. What's included Upper cup Lower cup Upper sealed stainlesssteel bearing (imported) Lower sealed stainlesssteel bearing (imported) CNCmachined aluminum alloy shell (anodized black, blue, or silver) Technical specifications Headset type: 11/8' threadless Head tube inner diameter: 34.0 mm Fork steerer outer diameter: 28.6 mm Bearing type: Imported stainlesssteel sealed bearings (upper and lower) Shell material: Aluminum alloy, CNC machined, forged Weight: Approx. 120 g Finishes: Anodized black, blue, or silver Compatibility: Standard and road bicycles using 11/8' threadless systems and modern head tubes requiring 34–34 mm headset sizing Installation notes Intended for threadless forks and head tubes sized as specified; verify your head tube inner diameter and steerer outer diameter before . Proper pressfitting tools or professional installation is recommended to ensure correct seating and avoid damage to cups or frame.